The Adventure's of Huckleberry Finn
I would like to convey to the writer of the example sentence that the word Adventure's, in its current _____ form, is grammatically incorrect (as opposed to its should-be plural form).
At first I started to use the word possessive to describe the form, but then I started thinking¹ that maybe, in the writer's mind, the word was in fact not written to represent possession but rather as a contraction of the words Adventure and is. In the latter case, I believe using the word contractional would be more appropriate than using the word possessive but since I don't know what the writer was (hypothetically) thinking when they wrote the word, I don't know which adjective to choose, if either.
I realize that chances are the writer just accidentally added an apostrophe where they shouldn't have, but that's neither here nor there.
What's the best word to use to describe the current, incorrect form of the word Adventures as described above? Is there an all-encompassing word that would be a better fit than the words possessive, contractional, or a combination thereof?
¹ Yes, it hurt. ;)